SmB向列相含氟氢键液晶新系列

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2022-11-19 DOI:10.1080/01411594.2022.2146503

Moez Sahli, Ines Gharbi, H. Ayeb, A. Guesmi, N. B. Hamadi, T. Soltani

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引用次数: 0

摘要

摘要采用4-n-烷氧基-2.3-二氟苯甲酸与4-戊基-4-联苯碳腈(5CB)混合制备了一系列新型氢键液晶。用差示扫描量热法和偏光光学显微镜测定了其热性能和液晶性能。详细讨论了末端酸供体对介生行为的影响。摩尔比为1:1的配合物均表现为近晶B相。此外，建立的二元相图表明，低浓度混合物在室温下表现为向列相，具有较大的稳定性。讨论了摩尔分数为x = 0.1的5CB/9OBAFF的介电、电光和粘弹性性能。

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New series of fluorinated hydrogen-bonded liquid crystals with SmB and nematic phases

ABSTRACT A new series of hydrogen-bonded liquid crystals was prepared by mixing 4-n-alkoxy-2.3-difluorobenzoic acid and 4-pentyl-4-biphenylcarbonitrile (5CB). Thermal and liquid crystal behaviour was established using differential scanning calorimetry and polarizing optical microscopy. The influence of terminal acid donors on mesogenic behaviour was discussed in detail. It was found that all complexes with a (1:1) molar ratio exhibit the smectic B phase. In addition, the binary phase diagram that has been established revealed that the mixtures with lower concentration exhibit a nematic phase at room temperature with large stability. Dielectric, electro-optic and viscoelastic properties of 5CB/9OBAFF with molar fraction x = 0.1 were discussed.

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.